Siemens SIMATIC HMI TP27 Equipment Manual page 211

System Messages
Procedure for In the case of all system messages that relate to "internal errors", please follow
"internal errors"
the procedure outlined below.
a) Switch off the OP, set the PLC to STOP mode and then restart both units.
b) During startup, set the OP to download mode, downlaod the configuration
c) If the fault recurs, please contact your nearest Siemens representative.
C-12
again and then restart the OP and PLC again.
When doing so, please quote the number of the error that has occurred and
any variables referred to in the message.
TP27, TP37 Equipment Manual
Release 01/00